Pattern for making rolls



' June 23, 1925. 1,543,229

W. H. NICHOL$ PATTERN FQR MAKING ROLLS Original Filed Nov. 1, 1922 2Sheets-Sheet 1 I' l I l l INIENTOR W. H. NICHOLS PATTERN FOR MAKINGROLLS June 23, 1925. 1,543,229

Original Filed Nov. 1, 1922 2 Sheets-Sheet 2 Patented June 23, 1925.

UNITED STATES PATENT OFFICE.

WILLIAM H. NICHOLS, OF WILKI'NSBURG, PENNSYLVANIA.

PATTERN FOR MAKING ROLLS.

Original application filed November 1, 1922, Serial No; 598,360. Dividedand this application filed March 13, 1924. Serial No. 699,043.

To all whom it may concern:

Be it known that I, VVILLLADI I-I. NICHOLS, a citizen of the United.States, and resident ofv W'ilkinsburg, in the county of Allegheny andState of Pennsylvania, have invented a new and useful Improvement inPatterns for Making Rolls; and I do hereby declare the following to be afull, clear, and exact description thereof.

My invention relates to patterns for molds for forming the necks ofrolls cast in groups or clusters, and for similar purposes and itrelates particularly to patterns for drag molds for use in castingclusters of rolling mill rolls.

The general object of my invention is to provide an improved sand moldfor simultaneously casting two articles having horizontal runners inline with each other and embedded in the sand. In preparing such a moldit is a diificult matter to remove the patterns which form the runners.An important feature of my invention is the provision of a method ofremoving patterns from a mold of the kind described, this methodconsisting, in general, in providing an additional pattern which isremoved after the mold is tam-pod and which gives access to the runnerpatterns. The opening or-openings left by the additional pattern arethen closed by means of cores previously formed from molding sand or thelike; This method of molding is set forth and claimed in my applicationfor Letters Patent tiled Nov- 1, 1922, Serial No. 598,360, of which thepresent application is a division.

In my Patent 1,455,091, issued May 15, 19-23, I have described andclaimed a novel method of casting chill rolls consisting in arranging aplurality of molds around a common upright pouring gate and pouringmolten metal simultaneously through the upright gate into all of themolds. As shown in said patent, the chills and the upright gate-borareall'mounted upon a common drag flask in which the neck cavities,horizontal sprue-runners and the lower end of the upright pouring gateare: molded in sand, I

My prior application No; 598,360,. and also the present application, arecontinuations of the application. for Patent 1,455,091, mentioned above.The present application is specifically concerned with the patterns bymeans of which the neck cavities, spruecavities are connected by meansof runners with a common pouring gate.

In the accompanying drawing, Fig. 1 is a vertical sectional view througha group of chill molds arranged for casting rolls according to myabove-mentioned patent, and provided with a drag mold constructedaccording to my present invention; Fig. 2 is a plan view of the dragflask and patterns;

Fig. 3 is a vertical sectional view of the drag flask and patterns shownin Fig. 2; Fig. 4: is a vertical sectional View similar to- Fig. 3,showing the flask filled with sand and inverted preparatory toremoving'the patterns; Fig. 5 is another vertical sectional view similarto Figs. 3 and 4:, showing the manner in which the sprue patterns, areremoved; Fig. 6 is another vertical sectional view similar to Figs. 3 to5, showing the final appearance of the mold after the pat-' terns havebeen removed and the core blocks placed over the sprue runners; F 7 is aplan view of the complete drag mold shown in section on Fig. 6; Fig. 8is a detail plan view showing the construction of the patterns used inmolding the sprue runners; Fig. 9 is a detail plan view showing the coreblocks which are placed over the inner portions of the sprue runnersafter the patterns have been removed and Fig. 10 is a detail showing invertical section the relation between the core blocks and the spruerunners.

In the drawing the numeral 2 indicates a metal drag flask designed forcasting four chill rolls. In order to receive the neck molds for thefour rolls, the flask 2 is provided with four recesses 3 of generallycircular form which communicates with a common central space throughstraight channels 5.

Fig.8 shows a wooden pattern consisting of a four-armed member or cross10 having a central projection 11 extending from one surface thereof.The pattern also includes four sprue patterns, each consisting of twosections6 and 12, which are made separate from the cross 10 and areadapted to be laid thereon when the pattern is as- 7 and 10.

sembled. Four neck patterns 13 are also provided for shaping the necksand couplers of the rolls, as shown in Fig. 3, each having a pin 14adapted to enter the openings 9 in a follower-plate 7 which rests on theusual bumper, not shown.

In assembling the mold patterns, the flask 2 is placed in properposition on the follower plate 7, the cross 10 is set in the center ofthe flask, the sprue patterns 6 and 12 are then laid upon the arms ofthe pattern member 10, as shown in Figs. 3 and 8, and the neck patternsare placed in position at the ends of the sprue runners, with their pinslt inserted in the openings 9. A little sand should be placed under theprojecting sprue patterns 12, as shown at 15, Fig. 3, in order toprevent these patterns from tipping over. Molding sand is then tampedinto the flask in the usual manner, care being taken that the sand shallbe forced beneath the sprue patterns 12.

After the sand .is tamped in the flask, the flask is inverted upon asuitable bottom plate 16, as shown in Fig. 1. The neck patterns 13 arethen lifted out, and the four-armed pattern member 10, is also liftedfrom the sand. This leaves the sprue patterns still embedded for aportion of their length within the sand. In order to remove these spruepatterns the inner pattern sections 6 are lifted, as shown in Fig. 5,leaving room for the outer sections 12 to be pulled lengthwise into theopen space left by the fourarmed pattern 10. The sections 12 are pulledhorizontally one by one in the manner stated, and are lifted sidewiseand vertically from the mold.

The spaces originally occupied by the four arms of the pattern member 10are then filled with core blocks 17 previously molded from molding sandand of proper size to fit in these openings, and covering the spruerunners 18, as shown in Figs. 6, The neck cavities 13 are then finishedand coated in the usual manner, and the drag is ready for use as shownin Fig. 2. When the drag is assembled with the chills and upright gatebox, substantially all of the upper surface of the sand is covered bythese parts which prevent the sand from being forced up above the spruerunners during the pouring operation. The arms of the cross pattern 10have their sides tapered slightly, as shown in Figs. 3, 4 and 10, inorder that this pattern may be readily lifted from the sand, and thesides of the core blocks 17 are similarly tapered.

Fig. 1 shows the complete assemblv of the group of chil mold: :ling thedra mold described above. chills 20, upper boxes 21, sink head 22, andan upright gate box 23 to the upper end of which is secured a funnel 24.The vertical opening 25 in the upright gate box is in line with thecentral opening 26 in the upper surface of the drag mold, and the spruerunners 18, molded in the manner described above, communicate radiallywith this central opening 26 and enter the neck cavities 13 tangentiallyin order to produce the proper swirling movement of the metal.

In the operation of the mold shown in Fig. 1 to form a group of rolls,the molten metal is brought to the mold in a ladle and is poured intothe funnel 24L, whence it passes down through the upright channel 25 inthe upright gate box 23 and through the horizontal sprue runners 18 intothe lower portions of the molds. Some of the molten metal remains in thecentral cavity 26 and serves as a cushion to prevent the descendingmetal from splashing.

It will be observed that the sides of the sprue runners 18 convergebefore entering the neck cavities of the molds. This gives a nozzleeffect, causing the molten metal to be injected into the molds moreforcibly than would be the case if the sprue runners were of uniformcross section throughout their length.

After the rolls are cast the chills and the upper boxes are removed andthe cast rolls are lifted from the drag. 'Since there is nothing at thistime above the sprue runners 18 except molding sand, the metal which hassolidified in the horizontal runners is easily lifted from the drag,sometimes carrying with it the molding sand, and at other times breakingthrough the molding sand.

I claim as my invention:

1. Molding apparatus comprising a pattern member and a second patternmember adapted to be laid upon said first-named pattern and to projectbeyond said firstnamed pattern member, and a wall-forming block adaptedto be inserted into the recess formed by the first-named pattern member,upon removal of the pattern members, to form a wall for the recessproduced by the said second pattern member.

2. Molding apparatus comprising a pattern member and a narrower patternmember adapted to be laid upon said first-named pattern member and toproject beyond said first-named pattern member, said second patternmember being composed of two separate sections laid end to end.

3. Molding apparatus comprising a pattern member having two oppositelyextending arms separated by a projection, pattern members adaptedto belaid upon the arms of said first-named pattern member and to projectbeyond the ends of said arms, and wall-forming blocks adapted to beinserted in the space occupied by said arms upon removal thereof.

4. Molding apparatus comprising a pattern member having two oppositelyextending arms separated by a projection, and pattern members adapted tobe laid upon the arms of said first-named pattern member and to projectbeyond the ends of said arms,

each of said second pattern members being composed of two separatesections laid end to end.

5. Apparatus for making molds for casting chill rolls in groupscomprising a pattern member having four horizontal arms and having avertical projection at the junction of said arms, and sprue patternsnarrower than the arms of said first-named pattern member, said spruepatterns being adapted to be laid upon the arms of said first-namedpattern and to project beyond the ends of said arms, the recessesproduced by said four arms being adapted to receive blocks for formingone wall of the sprues produced by said narrower patterns.

6. Apparatus for making molds for casting chill rolls in groupscomprising a pattern member having four horizontal arms and having avertical projection at the junction of said arms, and sprue patternsnarrower than the arms of said first-named pattern member, said spruepattern being adapted to be laid upon the arms of said first-namedpattern and to project beyond the ends of said arms, each of said spruepatterns being composed of two separate sections laid end to end.

7. Apparatus for making molds for casting chill rolls in grou scomprising a pattern member having our horizontal arms and having avertical projection at the unction of said arms, and s rue patternsnarrower than the arms 0 said first-named pattern member, said spruepatterns being adapted to be laid upon the arms of said first-namedpattern and to project beyond the ends of said arms, the outer sectionof each of said sprue patterns being tapered toward its outer end, therecesses produced by said four arms being adapted to receive blocks forforming one wall of the sprues produced by said narrower patterns.

In testimony whereof I, the said WIL- LIAM H. NIoHoLs, have hereunto setmy hand.

WILLIAM H. NICHOLS.

